Gravel crushing and screening device



Dec. 11 1923. 1,47 ,330

H. S. EARLE GRAVEL CRUSHING AND SCREENING DEVICE Filed Sept. 25 Q 1919 3 3 Sheets-Sheet 1 N Dec. 111, 1923. 1,476,880

H. S. EARLE GRAVEL CRUSHING AND SCREENING DEVICE Filed Sept. 25 1919 5 Sheets-Sheet 2 arm 11? LE.

Dec. 11 1 923.

1,476,880 H. s. EARLE GRAVEL CRUSHING AND SCREENING DEVICE 3 Sheets-Sheet 5 Filed Sept. 25 1919 grwe/wbom H0 19770). 5%L 55 Patented cc. ll, 1923.

HORATIO S. JEARLIE, F DETROIT, MICHIGAN, ASSIGNOR TO ACME ROAD MACHINERY (20., 03E FRANKFURT, NEW YORK, A CORPORATION OF NEW YORK.

GRAVEL CRUSHING- AND SCREENING DEVICE.

Application filed September 25, 1919. Serial No. 326,176.

To all whom it may concern:

Be it known that l, HORATIO S. EARLE, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan,

have invented a certain new and useful Tmprovement 1n Gravel Crushing and Screening Devices, and declare the following. to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification;

i This invention relates to gravel screening 7 and crushing machines, and the general object of the invention is to provide a device for the screening of gravel and the crushing of the larger size stone therein and delivering both the screened and the crushed gravel "to a conveyor for the final screening to size.

lleretofore, gravel crushing devices have been used but the output with the previous known machines is materially limited due to the fact that all of the sand or gravel passes through the crusher. It is a well known fact that the usual gravel pits contain sand andgravel'of agreat many different sizes some of which is of such large size as to be unusable until crushed. This invention seeks to provide a means whereby the smaller size gravel is separated from the larger size and delivered directly to a con veyor and the larger size gravel only is passed through the crusher and then delivered to the same conveyor whereby the output of the machine is very materially increased. This principal object' and the several minor objects are hereinafter more fully described and the mechanism embodying my invention is shown in the accompanying drawings in which- Fig. 1 isa side elevation of a gravel screening and crushing device embodying my invention.

Fig. 1,' consists of a framework 1 provided with a forward supporting wheel 2 and with rear wheels 3 on which frame is mounted and the usual stone crusher 4t hereinafter more fully described. Above this supporting frame 1 is a framework 5 carrying a platform '6 for the operator. On one side of the machine'is a bucket conveyor 7 by means of which the sand and gravel is delivered at the top into what I have termed a chute 8 at the bottom of which'is what is known as grizzly screen 9 consisting of a series of parallel inclined bars 10 shown more particularl in Fig. 3. As willbe understood from ig. 2, material passing through the screen falls onto an inclined chute 11 and is delivered onto a reversely inclined chute 12 discharging at the bottom onto a belt conveyor 13. Thusthe material delivered from the pit to the grizzly screen that is of a size to pass through the screen is directly delivered-to the belt 13. The-lower end of the grizzly screen delivers the larger material into the mouth of the crusher t as in dicated by arrows. This crusher is of the ordinarytype having the hardened steel crusher members 1 1- and 15 between which.

lation of the member 15 toward the first,

member 1 1, the crushed material finally passing out between the crushing members at'the lower end and discharging directly onto the belt 13 and is conveyedwith the screened material on the belt to the opposite end where it may be removed to a concrete mixer or otherwise disposed of as may be desired.

The mechanism is simple in form and the crusher may be driven by means of a belt 18 connected to one or the other of the balance wheels 16 or 17 for the crusher and in this case the belt 18 runs from a small pulley 19 on the shaft of the wheels 16 and 17 to a pulley 20. The pulley 20 is mounted at the rear of the machine on a shaft 24 on which is a sprocket wheel 21 connected by means of a sprocket chain 37 with the sprocket 22 on the shaft 23 on which is a roller for the belt 13 and by means of which the said belt is driven. The shaft 24 of the pulley 20 has a bevel pinion 25 on the end opposite the sprocket wheel 21, and adjacent the belt wheel 20 as may be understood from Figs. 3 and 1. A. bevel gear 26 is provided on a shaft 27 meshing with the pinion 25. On

i this shaft 27 is a sprocket wheel 28 connect ed by means of a chain 29 with a sprocket 3O on the upper end of the frame of the bucket conveyor 7. In operation power is applied to the balance wheel 16 of the crusher by means of a belt (not here shown) from an internal combustion engine or other source of power (not here shown) to the flange 78 on the wheel 16 which forms a pulley for the said belt. Rotation of the wheel 16 sets the bucket conveyor 7 in operation through the mechanism hereinbefore described which delivers the gravel into the top of t'he chute 8 whereupon the fine gravel is separated from the coarse gravel by the screen 9 the fine gravel being delivered to the conveyor belt 13 and the coarse gravel passing through the crusher 4 driven by the power driven balance wheel 16 before being'delivered to the conveyor belt 13. By the application of power to the balance wheel 16 all of the operative mechanism is actuated through the belt l8 and chains 29 and 37.

It is thus evident that the mechanism is comparatively simple in operation and by the co-operative relationship of the several parts a machine is secured of far greater output'than the usual gravel crushing machines now in use, and that the etficiency is extending to one side of the machine for delivering material of various sizes to the screen conveyor wherein the large material is discharged to the crusher and the finermaterial passed through the screen, a driven conveyor member to which the crushed discharges, and a chute delivering the screened material to said driven conveyor.

2. A portable gravel crushing and screening device comprising. a wheeled frame including a platform, a rock crusher carried by the frame below the platform, a vertical chute extending upward from the frame at one end of the platform, a bucket conveyor discharging into the vertical chute and lying at an angle thereto on one'side of the device, said bucket conveyor being arranged to be varied as to its angle, means for applying power to the crusher and to the bucket conveyor, a screen member at the bottom of the vertical chute providing a con veyor for discharging oversize material into the crusher and passing material below certhereby adapted to crush material discharged thereinto to certain fineness, a screen member. providlng a conveyor for material to the crusher, an elevator conveyor.

for taking material indiscriminately from a sand bank or supply source and deliver it to the screen conveyor whereby the larger material is discharged to the crusher and the finer material is discharged through the screen, said elevator conveyor being adjustable and adapted to occupy various positions relative to the screen conveyor, and a conveyor member to which both the crusher and the screen member discharge material.

4. In a gravel crushing and screening device, a crusher adapted to crush material discharged thereinto to certain fineness, a screen member providing a conveyor for delivering oversize material to the crusher, the undersize material passing therethrough, a driven conveyor taking material discharged from the crusher, a chute beneath the screen conveyor, and a second chute into which the said first named chute discharges, said second chute discharging to the driven conveyor.

5. A portable gravel crushing and screening device comprising a wheeled framework including a platform, a rock crusher carried by the frame below the platform, a vertical chute extending upward from the frame at one end of the platform, an elevator conveyor adjustably supported at its upper end adjacent the vertical chute and adapting the same to take material at various distances from the machine and discharge to the vertical chute, an inclined screen member providing a conveyor to deliver oversize material to the crusher and to pass that below certain size therethrough. a chute for the material passing through the screen ositioned therebeneath, and a second chute 1nto which said inclined chute discharges,'a driven conveyor to one end of which the rock crusher discharges and to which said second chute discharges at a distance therefrom, and a driving means common to the crusher, elevator conveyor, and driven conveyor.

In testimony whereof, I sign this specification.

' HOBATIO S. EARLE. 

